Hi Vlad, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 06d5d309a3f17e32cd59926f391db1e1ea652184 commit: 34ca65352ddf2aaa094f4016369103c4c7b98958 net/mlx5: E-Switch, Indirect table infrastructure date: 3 weeks ago config: x86_64-randconfig-a001-20210301 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project b077d82b00d81934c7c27ac89dd8b0e7f448bded) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 34ca65352ddf2aaa094f4016369103c4c7b98958 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c:41: mlx5_esw_indir_table_init(void) ^ drivers/net/ethernet/mellanox/mlx5/core/esw/indir_table.h:33:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct mlx5_esw_indir_table * ^ static mlx5_esw_indir_table_destroy(struct mlx5_esw_indir_table *indir) ^ drivers/net/ethernet/mellanox/mlx5/core/esw/indir_table.h:39:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void ^ static mlx5_esw_indir_table_needed(struct mlx5_eswitch *esw, ^ drivers/net/ethernet/mellanox/mlx5/core/esw/indir_table.h:60:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool ^ static 3 warnings generated. vim +/mlx5_esw_indir_table_init +34 drivers/net/ethernet/mellanox/mlx5/core/esw/indir_table.h 30 31 #else 32 /* indir API stubs */ 33 struct mlx5_esw_indir_table * 35 { 36 return NULL; 37 } 38 39 void 41 { 42 } 43 44 static inline struct mlx5_flow_table * 45 mlx5_esw_indir_table_get(struct mlx5_eswitch *esw, 46 struct mlx5_flow_attr *attr, 47 struct mlx5_flow_spec *spec, 48 u16 vport, bool decap) 49 { 50 return ERR_PTR(-EOPNOTSUPP); 51 } 52 53 static inline void 54 mlx5_esw_indir_table_put(struct mlx5_eswitch *esw, 55 struct mlx5_flow_attr *attr, 56 u16 vport, bool decap) 57 { 58 } 59 60 bool 62 struct mlx5_flow_attr *attr, 63 u16 vport_num, 64 struct mlx5_core_dev *dest_mdev) 65 { 66 return false; 67 } 68 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org